import java.util.Enumeration;
import java.util.LinkedList;
import java.util.*;
import java.util.concurrent.ConcurrentHashMap;

/**
 * Created with IntelliJ IDEA.
 * Description:
 * User: 石方旭
 * Date: 2022-07-03
 * Time: 22:39
 */
public class TestDemo {

    public static void main(String[] args) {
        PriorityQueue<Integer> priorityQueue = new PriorityQueue<>();
        LinkedList<Integer> linkedList = new LinkedList<>();
    }

}
